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Demco A-Frame Couplers
Demco Brake Actuator Couplers

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Expert Answers about Demco

  • How To Check if Trailer Surge Brakes Are Working Properly On Tandem Axle Boat Trailer
  • Checking the brakes can be done in two ways. The easiest way is to raise one side of the trailer and spin the wheels while someone applies the surge brakes at the coupler. The better way would be to remove each of the wheels and brake drums and activate the brakes while making sure the wheel cylinders and brake assemblies are functioning properly. After this the first thing I would do is bleed the brakes using the trailers surge coupler to force the fluid from the brake lines and make...
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  • Stainless Steel Rotor, Caliper, and Additional Components for 8,000 Pound Dexter Axles
  • We have a couple different options for you to upgrade the components on your boat trailer. For a kit that comes with a hub and rotor, you can use the Kodiak Disc Brake Kit, 13 Inch Hub/Rotor with 8 on 6-1/2 Wheel Bolt Pattern for 8,000 Pound Dexter Axles # K2HR89DDS. This kit comes with dacromet-plated, cast iron rotor-and-hub assemblies, stainless steel calipers, stainless steel caliper mounting brackets, and stainless steel mounting bolts. The bearings, races, and seal measurements...
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  • Recommendation for Installation of a Brake Mounting Flange on a Trailer Spindle and Axle
  • Welding a mounting flange, possible item # 4-35, is a very precise installation. The flanges need to be installed square and concentric to the hub and drum assembly and each other. If the flange is installed incorrectly rapid brake lining wear, improper braking, trailer dog legging, bearing failure, rapid tire wear and, worst of all, weakening of the axle can occur. Usually special jigs are used to install the flange. The jig will keep the flange square and concentric to the axle and...
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  • When Replacing Trailer Brake Lines Is Bleeding the System Required to Get Fluid to Assemblies
  • You will need to bleed the brake system to get all of the air out of the lines after replacing the brake lines. Filling up the master cylinder will get some fluid into the lines but not a whole lot. You will need to keep bleeding them till there are no air bubbles that come of the wheel cylinders. If you have a power bleeder you would not need to actuate the actuator to build pressure as the power bleeder will do that for you. To make bleeding the brakes easier and quicker we have...
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  • Difference Between Demco Hydraulic Trailer Brake Actuator DA66B # 8605001 and Previous DA66 Model
  • I spoke with my contact at Demco and he said that there really is no difference between Demco Hydraulic Trailer Brake Actuator DA66B, # 8605001, and the DA66 that you have on your trailer. They just did a name change.
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  • Hydraulic Disc or Drum Trailer Brakes for 10 Inch Wheels
  • We have several options for trailer brakes that will fit a 10 inch wheel. For a 10 inch wheel you will need a 8-1/2 inch hub and drum assembly such as # T1544500042 which has a 5 on 4-1/2 bolt pattern. Then for hydraulic drum brakes we have just one option, # T4442000 for the right side and # T4442100 for the left side. These are designed for 3,000 pound axles. For disc brakes we have the following options: For 2,000 pound axles we have # K2HR2D or # K2HR2E. For 3,500 pound axles...
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  • Recommended Replacement Hydraulic Brakes with 10-Inch Diameter for a Boat Trailer?
  • Knowing the inside diameter of the drum is the key piece of information we need; the brand of the assembly will not be a factor in determining what you will need to replace your hydraulic brakes. You mentioned your trailer's GVW, but it is the trailer's axle weight capacity which determines the size of the brake assembly you are going to need. For example, a drum with a 10-inch diameter like yours fits brake assemblies for a 3,500 lbs axle. For your boat trailer, I recommend the Demco...
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  • What are the Correct Replacement Wheel Cylinders for Demco Hydraulic Trailer Brakes # 40716
  • If you have Redline brakes (part # 40716 is actually Demco), then you will need to use Redline Wheel Cylinder, # BP17-030 (left) and # BP17-020 (right). The correct replacement wheel cylinder for your hydraulic trailer brake assemblies is determined by the brand and size of brake assembly that is on your trailer.
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  • Fit of Demco # DM8104311 Hydraulic Brake Actuator
  • The Demco # DM8104311 is compatible with 3 inch wide straight trailer tongues. You can see our return policy by clicking the provided link.
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  • Removing Surge Coupler-Actuated Brakes from Mc Clain Boat Trailer
  • If you want to deactivate the hydraulic brakes on your boat trailer, you can certainly do so. The simplest way to do this would be to drain the brake fluid from the lines by disconnecting the brake lines from the wheel cylinders and allowing the fluid to drain. You'd then immobilize the articulating portion of the coupler by drilling holes in either side and sliding a bolt through to prevent the coupler from compressing. A better long term option would be to remove the coupler and replace...
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  • Can Free-Backing Brakes Replace Non-Free-Backing Breaks on 2001 EZ Loader Boat Trailer
  • You can use free-backing brake assemblies on your trailer in place of the existing non-free-backing brakes. For your 2001 EZ Loader boat trailer I recommend the Demco Hydraulic Drum Brake Assemly, Free Backing, Galvanized, for 10 Inch Brakes # 40715 for the right- hand side and # 40716 for the left-hand side. The galvanized steel will resist rust, making these assemblies great for your boat trailer. I have attached an installation video of these brakes for you. Another great option is...
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  • Troubleshooting Surge Brakes Locking up When in Reverse
  • With surge brakes, you have a brake actuator applying the needed pressure to the brakes but to be able to back up you will need to have a manual lockout or an electric lockout solenoid, like # T4748800, which will close when you shift the vehicle into reverse, allowing the trailer to be backed up. You may also need a solenoid cover like the Titan # T4835800183, depending on what brake actuator you currently have. Typically surge brakes are found on boat trailers, and commonly the...
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  • What Braking Assemblies do I Need for Karavan Tandem Axle
  • If the bolt pattern on your axles, for the backing plate, is 2-3/4 inch on center , both of these braking assemblies would fit your 10 inch x 2-1/4 inch trailer brake assemblies. Part # 40715 and # 40716 are what I would recommend. These are the left and right hand side brake assemblies. Since you are going to be backing up an incline you want the least amount of reverse braking which is why I recommend these over the other. The shoes for these assemblies are part # BP04-126. The...
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  • What Material Is Used For Fittings On Demco Hydraulic Brake Hose
  • I called my contact at Demco and they told me that the fittings that are used on all of their brake line and hose products like the Hydraulic Brake Hose, part # DM05982 are made of an E-coat Steel. When I asked what E-coating is they said it is a coating process similar to galvanizing.
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  • Determining If Surge Brake Actuator Has Lockout or If Brakes are Free-Backing
  • The only way to turn a surge brake actuator "off" is to engage a lockout on the actuator. Some actuators have manual lockouts, others have electric lockouts, and some have no way to lock out the actuator. Typically, free-backing brakes are used with actuators that have no lockout. As long as the trailer brakes engaging when your tow vehicle is stopping, the brakes are working correctly. I have attached photos showing a manual lockout and electric lockout to help you determine if your...
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  • Can a Weld-On A-Frame Trailer Coupler be Bolted On Instead of Welded
  • The A-frame couplers we carry, like # 12660-97SP, are weld-on applications and cannot be bolted on to a trailer frame. Any welding should be done by a qualified welder in a shop that works on trailers. The coupler you have reference accepts a 2-5/16 inch diameter ball. I have included a link to all of the A-frame coupler options for you to view.
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  • How to Bleed Trailer Surge Brakes
  • I attached a video that details how to bleed surge brake actuators for you to check out. First top off the master cylinder with appropriate fluid. Next you will want to pump the fluid from the master cylinder. You can do this by unbolting the plate that holds the lever in place and then use that lever to actuate the master cylinder and force the fluid through. On some units, you will have to manually activate it at the point where the hitch ball moves in and out. The model in the video...
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  • Would Demco Brake Actuator part # 8605001 Replace Atwood Actuator Stamped # 61101
  • The number 61101 isn't actually a part number, but from a different question we answered here we were able to determine that the part number you are looking for that your couple would have is 82543. Which our part number for that would be # AT82543. This would be an exact replacement for what you have. Or, the part # 8605001 that you referenced would work as well since it also has it's mounting holes 3 inches apart.
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  • How to Determine if Trailer Has Reverse Lock Out When Picking Out Brake Assemblies
  • Is there a solenoid screwed in to the back of the master cylinder on the trailer? Or is there a lever on the actuator that you move whenever you need to be able to back the trailer up? If so, then you have a reverse lock out. I attached a link to a page that has all of the hydraulic assemblies we carry. If you need free-backing plates there is a filter on the page that you can select that will take you to a page that has all of the free-backing assemblies we carry. You also will want...
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  • Dimensions of Demco # DM14793-81 Trailer Coupler
  • If you look at the diagram that I received from my contact at Demco, you can see several of the dimensions of the # DM14793-81 trailer coupler. If there were other dimensions you were needing, please let me know.
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  • Manual Reverse Lockout for Demco D91 Trailer Brake Actuators
  • Yes! The manual reverse lockout kit you are looking for is the # DM5939 for D91 Demco Hydraulic Trailer Brake Actuators. I have linked the product and installation instructions to this page for your convenience.
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  • Bolt Hole Dimensions Of Demco Brake Actuator # DM8669112
  • The mounting holes of the Demco Hydraulic Brake Actuator w/ Drop - Drum - Zinc - 2" Ball - 8,000 lbs # DM8669112 are in the same exact locations as you mentioned. From front bolt to second bolt center to center is 3 inches. From the front bolt to the rear bolt center on center is 12-1/2 inches. This bolt-on installation requires 1/2 inch by 4-1/2 inch Grade 5 bolts that are not included. I've attached a photo to help.
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  • Comparing Demco Trailer Coupler # DM15000-52 to # 12564
  • The Demco Channel Tongue Trailer Coupler - eZ-Latch - Silver - 2" Ball - Bolt On - 10,000 lbs # DM15000-52 is a bolt on coupler for a pole tongue trailer. It is compatible with 3 inch channel width and has bolt holes in the spacing I've attached in the photo. It has an automatic latch that will allow you to connect when the latch is in the closed position by just dropping the coupler over the ball, the latch with snap into place. It has a silver powder coat finish and is rated for 500-hour...
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  • Coupler Lock Recommendation for Use with Demco Channel Tongue Trailer Coupler
  • Yes the coupler part # DM13689-52 that you referenced is lockable. For a pin style lock the part # 28012 would work well. Or for a lock that goes around the coupler opening the part # DT25013KA would be a great option. I attached review videos for both locks.
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  • Mounting Drum Brakes to an EZ-Loader Trailer with 4-Bolt Brake Mounting Flange
  • If you are wanting to install your brakes on your EZ-Loader trailer, you will need brake mounting flanges with a 4 bolt pattern that matches the bolt pattern of your brake assemblies. We do carry some brake mounting flanges, but we will need to know the diameter of your axle or spindle shaft to determine if we have a brake mounting flange that will fit your trailer. The brake mounting flanges will need to be welded on square, so we recommend having a qualified professional with trailer...
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  • Why Do Demco Hydraulic Brake Assemblies Have Brake Linings Riveted to the Brake Shoes
  • Riveting the linings on brake shoes on hydraulic brake assemblies was historically the industry standard, while electric brake assemblies typically have the pads glued or bonded into place. All Demco could tell me is that they rivet all of their brake linings. I also spoke with folks at Dexter. I was told that in the past the adhesives used to bond the linings on the shoes were unable to withstand harsh marine environments. If water should penetrate between the shoe and the lining, rust...
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  • Above Bed Base Rails and Install Brackets for Older Hijacker 5th Wheel Hitch on 2005 Ford F-150
  • I spoke with my contact at Demco about the hitch part number you provided in order to find the correct base rails to install in your 2005 Ford F-150. The FWH 24PA is the part number for the hitch head that fit older Hijacker 5th wheel hitches. My contact at Demco confirmed that these hitches do not fit in Industry Standard Rails and require a particular rail kit, the Replacement Rails for Demco Hijacker 5th Wheel Trailer Hitch, Older Models # DM6014. These above bed rails are designed...
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  • Boat Trailer Brake Assembly Recommendation for a 3500 UFP Axles
  • Yes, the Demco Hydraulic Drum Brake Assembly # 18787 would be the correct assembly for the right hand side of your trailer and the part # 18788 would be the correct assembly for the left hand side of the trailer. If your current brake assemblies only have a 1-3/4 inch width they are not fully utilizing the 2-1/2 inches of drum width that you measured. The bolt pattern of the flange is also the same as what you have. Check out the picture I attached to see these measurements. These...
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  • Open Face Wheels For 24 Ft Road Ranger Travel Trailer
  • It sounds like you have vintage wheels you are dealing with on your 24 ft Road Ranger. We do offer a couple of the vintage wheels. They are part # AM20501 and part # AM20395. These are both 15 inch rims and have a 4 bolt pattern. I have attached several links to articles that are helpful when trying to determine what kind of tires and wheels are needed. You can see how to take the measurements needed to find the correct fit for your trailer. I have also attached a link to our product...
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  • Package Contents of Demco A-Frame Trailer Coupler with Jack Center Hole # DM13205-52
  • The Demco coupler # DM13205-52 you were looking at does not include the hardware needed for installation. It would be a good idea to switch over from your weld on to a bolt on coupler, this will make it a whole lot easier to replace over time as it wears out as you have stated.
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